Process for the isomerization of C5/C6 hydrocarbon cuts with chlorinated compound recycling

A process for the isomerization of a feed of hydrocarbon compounds comprising C5 and/or C6 hydrocarbon compounds, said process comprising a loop for recycling at least one chlorinated compound which has the following steps:

• a) supplying an isomerization unit (1) with at least one portion of said feed of hydrocarbon compounds and isomerizing said at least one portion in the presence of a chlorinated catalyst;
• b) supplying a stabilization unit (20) comprising at least one stabilization column (2) with the effluent obtained from the isomerization unit (1) and separating said effluent into:
• a gaseous effluent comprising at least one chlorinated compound;
• a liquid effluent comprising a concentration CA of C5+ compounds;
• and
• a liquid flow comprising at least one isomerate of the feed of hydrocarbon compounds;
• c) providing an absorption unit (7) comprising an absorption column (3), wherein the absorption comprises:
• a first contact between the gaseous effluent obtained from step b) and a washing fluid, said washing fluid being selected from a portion of said feed of hydrocarbon compounds and/or at least a portion of said liquid flow comprising at least one isomerate of the feed of hydrocarbon compounds obtained from step b), wherein said washing fluid comprises a concentration CB of C5+ compounds, with CA<CB;
• a second contact between the gaseous flow resulting from said first contact and said liquid effluent obtained from step b);
• wherein in said absorption column (3), said gaseous effluent from step b) is supplied to the absorption column (3) below said washing fluid, and said liquid effluent from step b) is supplied to the head of the absorption column (3) above said washing fluid;
• d) extracting a liquid flow enriched in chlorinated compounds from the absorption unit (7) and recycling the liquid flow to the isomerization unit (1);
• and
• e) extracting said liquid flow comprising at least one isomerate of the feed of hydrocarbon compounds from the stabilization unit (20).